Sim Swap Protection

Hi, I listened to a podcast this morning about SIM card protection to avoid someone remotely swapping your SIM card to complete Two Factor Authentication requests and access financial accounts.

I have an iPhone and use AT&T. I cannot figure out how to set up the SIM protection on their website.

Has anyone successfully gone through the process? If so, how can I set this up? Or, is there an app that will do that? I could not find one.

Thank you!